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Ponencia
Alternative Space Definitions for P Systems with Active Membranes
(Escuela Técnica Superior de Ingeniería Informática, Universidad de Sevilla, 2020)
The first definition of space complexity for P systems was based on an hypothetical real implementation by means of biochemical materials, and thus it assumes that every single object or membrane requires some constant ...
Ponencia
Characterizing PSPACE with Shallow Non-Confluent P Systems
(Universidad de Sevilla, Escuela Técnica Superior de Ingeniería Informática, 2018)
In P systems with active membranes, the question of understanding the power of non-confluence within a polynomial time bound is still an open problem. It is known that, for shallow P systems, that is, with only one level ...
Ponencia
Simulating counting oracles with cooperation
(Escuela Técnica Superior de Ingeniería Informática, Universidad de Sevilla, 2019)
We prove that monodirectional shallow chargeless P systems with active membranes and minimal cooperation working in polynomial time precisely characterise P#P k , the complexity class of problems solved in polynomial ...
Ponencia
Subroutines in P Systems and Closure Properties of Their Complexity Classes
(Fenix Editora, 2017)
The literature on membrane computing describes several variants of P systems whose complexity classes C are "closed under exponentiation", that is, they satisfy the inclusion PC C, where PC is the class of problems ...
Ponencia
A Toolbox for Simpler Active Membrane Algorithms
(Fénix, 2016)
We show that recogniser P systems with active membranes can be augmented with a priority over their set of rules and any number of membrane charges without loss of generality, as they can be simulated by standard P ...
Ponencia
Monodirectional P Systems
(Fénix Editora, 2015)
We investigate the in uence that the ow of information in membrane systems has on their computational complexity. In particular, we analyse the behaviour of P systems with active membranes where communication only ...
Ponencia
Constant-Space P Systems with Active Membranes
(Fénix Editora, 2014)
We continue the investigation of the computational power of space- constrained P systems. We show that only a constant amount of space is needed in order to simulate a polynomial-space bounded Turing machine. Due to this ...